Install Instructions

To ensure the system is installed correctly and without leaks, it is necessary to do a pressure test.
The pressure test can be done with pressurized air or water. However, due to the risk of water
freezing and damaging the system, MrPEX recommends air tesng.
To make the test, connect the MrPEX® pressure test kit with a 0÷100 psi gauge and an air valve,
or other pressure test device, to the manifold. Pressure test any poron of the system that will be
embedded in the oors, walls or ceilings of the building to 40 to 60 psi or as indicated by local code,
whichever is greater, for at least 30 minutes or for a sucient period of me to determine if any
leaks appears during the test. Reduce test pressure to 30 psi prior to embedding the tubing.
A 30 to 40 psi pressure test should remain during phases of construcon to monitor system integrity.
Note 1: If tubing is to be le under pressure for a longer period, make sure to reduce the pressure
to 30 psi
Note 2: Consult local mechanical code for specic requirement in your area
Note 3: Maximum pressure during the test should not exceed 145 psi
To ensure proper performance, it is important to fully ll the system with clean water and purge all
the air contained. In case of underoor heang systems is suggested to do this operaon directly
at the manifold.
The simple steps to ll and purge the manifold are as follows:
1 - Close the supply and return ball valves of the manifold
2 - Connect a hose from a faucet to the ll valve on the supply manifold. Another hose should be connected to the
ll valve posioned on the return manifold. The end of the hose connected with the return need to be placed into
a large bucket or into a drain within view
3 - Close all owmeters and on/o valves on the manifold
4 - Open the ll valves on supply and return manifolds by using the square tool on the caps of the valves. Aer this
operaon the water lls the supply manifold but doesn’t go into the circuits because the owmeters are closed
5 - Open the owmeter and the on/o valve of the rst loop. The water ows into the circuit and pushes the air
out. Connue lling unl no more bubbles are visible in the exit water or bucket
6 - When the rst circuit is lled, close rst the on/o valve, and then the owmeter
7 - Repeat steps 5 and 6 to ll and purge each manifold loop. Purging/lling one circuit at a me, ensures that all
the air gets removed from each loop
8 - When all circuits are lled, close the ll and drain valve posioned on the return manifold and subsequently
the ll and drain valve of the supply manifold. Remove the hoses from the ll valves and reposioning the safety
valve caps
9 - Open all the on/o valves and all owmeters, and then use the manual air vent on the top of each manifold
body to remove the remaining air in the manifold body
10 - Once the mains are totally lled and purged, open the manifold supply and return ball valves
Pressure Tesng the Manifold
Filling and purging the manifold